In 1857, after their attempts to smuggle contraband goods land them with a heavy fine from the BritishCustoms, Captain Illiam Quillian Kewley and his crew of Manx sailors are forced to offer their ship for charter. The vessel is quickly hired by a party of Englishmen headed by an eccentric Vicar, the Reverend Geoffrey Wilson, who believes that the Garden of Eden is located in Tasmania and wants to mount an expedition there to find it. However, unbeknownst to the clergyman, one of his fellow travellers has an entirely different reason for journeying to the island. Dr Thomas Potter is a renowned surgeon who is developing a thesis on the races of man and hopes to find some interesting specimens there.

Running parallel with this story, but starting some 30 or so years earlier, are the recollections of Peevay, one of Tasmania's natives, who describes the devastating impact the white settlers had on his people, and the aborigines' struggle to adapt to the cultural changes which were forced on them.

Many of the chapters alternate between the two different time periods, but when the Manx ship eventually docks in Tasmania, both strands of the story are brought together for the book's conclusion.